Southern Pacific 4449, also known as the Daylight, is the only surviving example of Southern Pacific Railroad's "GS-4" class of 4-8-4 "Northern" type steam locomotives and one of only two GS-class locomotives surviving, the other being "GS-6" 4460 at the National Museum of Transportation in St. Louis, Missouri. GS is an abbreviation of "General Service" or "Golden State," a nickname for California (where the locomotive was operated in regular service).